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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 13301. |
What will be the effect on phytochrome in a plant subjected to continuous red light? |
| A. | Level of phytochrome decreases |
| B. | Phytochrome is destroyed |
| C. | Phytochrome synthesis increases |
| D. | Destruction and synthesis of phytochrome remain in equilibrium. |
| Answer» B. Phytochrome is destroyed | |
| 13302. |
Induction of rooting in stem cutting by auxin treatment would be beneficial in which of the following? |
| A. | Marchantia |
| B. | Wheat |
| C. | Cuscuta |
| D. | Bougainvillea |
| Answer» E. | |
| 13303. |
The names of many organisms are associated with classical studies in some areas of biology. Which of the following does not show such matching? |
| A. | Pea-Laws of heredity |
| B. | Acetabularia-Relationship between nucleus and cytoplasm |
| C. | E. coli - Genetic engineering |
| D. | Barley seeds- Role of phytochrome |
| Answer» E. | |
| 13304. |
The movement of auxin is largely: |
| A. | Both acropetal and basipetal |
| B. | Basipetal |
| C. | Centripetal |
| D. | Acropetal |
| Answer» B. Basipetal | |
| 13305. |
Auxin inhibits the growth of: |
| A. | Apical bud |
| B. | Lateral axillary buds |
| C. | Roots on stem cutting |
| D. | Parthenocarpic development of fruits |
| Answer» C. Roots on stem cutting | |
| 13306. |
In short day plants (SDP) flowering is induced by: |
| A. | Photoperiod less than 12'hours. |
| B. | Photoperiod shorter than initial value and uninterrupted long night. |
| C. | Short photoperiod and interrupted long night. |
| D. | Long night |
| Answer» C. Short photoperiod and interrupted long night. | |
| 13307. |
Protoplasmic streaming movements are referred as [DPMT 1985] |
| A. | Autonomic movements of locomotion |
| B. | Thigmonasty |
| C. | Photonasty |
| D. | Movements of curvature |
| Answer» B. Thigmonasty | |
| 13308. |
The minimum time for which the stimulus must be applied in order to obtain a response is |
| A. | Conversion time |
| B. | Conduction time |
| C. | Presentation time |
| D. | Reaction time |
| Answer» D. Reaction time | |
| 13309. |
Thigmotropism is best exhibited by [AFMC 1998; RPMT 1998] |
| A. | Lamina |
| B. | Tendrils |
| C. | Root apex |
| D. | Thorns |
| Answer» C. Root apex | |
| 13310. |
Tropic movement is due to [CPMT 1998] |
| A. | Cell elongation |
| B. | Cell division |
| C. | Both a and b |
| D. | Cell thickening |
| Answer» B. Cell division | |
| 13311. |
Movements of leaves of sensitive plant, Mimosa pudica are due to [CBSE PMT 1988, 1999; CPMT 1989, 1991; AIIMS 1986; BHU 1997; CET Chd. 2002; Bihar PMT 2002; RPMT 1995, 2002; AFMC 1999; AMU 2002; MP PMT 2000] |
| A. | Thermonasty |
| B. | Seismonasty |
| C. | Hydrotropism |
| D. | Chemonasty |
| Answer» C. Hydrotropism | |
| 13312. |
Both nyctinasty and thigmonasty are observed in [DPMT 1985] |
| A. | Drosera |
| B. | Mimosa |
| C. | Utricularia |
| D. | Cuscuta |
| Answer» B. Mimosa | |
| 13313. |
Nastic movements differ from tropic movements in being [AMU 1987] |
| A. | Movements of variation |
| B. | Nondirectional |
| C. | Directional |
| D. | Stimulated by chemicals. |
| Answer» C. Directional | |
| 13314. |
Effect of length of day (light duration) on flowering is called [BHU 1979; CPMT 1984; CPMT 1991; JIPMER 2001] |
| A. | Phototropism |
| B. | Photoperiodism |
| C. | Photorespiration |
| D. | None of the above |
| Answer» C. Photorespiration | |
| 13315. |
The movement of organs in response to light is called [J&K CET 2005] |
| A. | Hydrotropism |
| B. | Thigmotropism |
| C. | Phototropism |
| D. | Geotropism |
| Answer» D. Geotropism | |
| 13316. |
One set of a plant was grown at 12 hours day and 12 hours night period cycles and it flowered while in the other set night phase was interrupted by flash of light and it did not produce flower. Under which one of the following categories will you place this plant [CBSE PMT 2004] |
| A. | Day neutral |
| B. | Short day |
| C. | Long day |
| D. | Darkness neutral |
| Answer» C. Long day | |
| 13317. |
Phytochrome is sensitive to [BHU 2001; Pb. PMT 2004] |
| A. | Red light |
| B. | Far red light |
| C. | Green light |
| D. | Both [a] and [b] |
| Answer» E. | |
| 13318. |
The response of different organisms to the environmental rhythms of light and darkness is called [CBSE PMT 1998] |
| A. | Phototaxis |
| B. | Phototropism |
| C. | Vernalization |
| D. | Photoperiodism |
| Answer» E. | |
| 13319. |
Photoperiod is an important factor which affects |
| A. | Flowering in many plants |
| B. | Moulting and migration in many temperate birds |
| C. | Breeding behaviour of some insects |
| D. | All the above |
| Answer» E. | |
| 13320. |
Generally the internode of a plant elongates most in |
| A. | Ultraviolet light |
| B. | Infra-red light |
| C. | Blue wavelength of light |
| D. | Complete spectrum of visible light |
| Answer» D. Complete spectrum of visible light | |
| 13321. |
The red absorbing form of phytochrome gets converted to the far-red absorbing form after getting irradiated at [BHU 1994] |
| A. | 660 nm |
| B. | 730 nm |
| C. | 530 nm |
| D. | 660 nm to 730 nm |
| Answer» B. 730 nm | |
| 13322. |
Pigment involved in photo-perception in flowering is [BHU 1991] |
| A. | Cytochrome |
| B. | Carotene |
| C. | Lycopene |
| D. | Phytochrome |
| Answer» E. | |
| 13323. |
In respect of photomorphogenesis plants are most sensitive to |
| A. | Blue light |
| B. | Red light |
| C. | Far-red light |
| D. | Ultraviolet light |
| Answer» C. Far-red light | |
| 13324. |
Short night plants are |
| A. | Long day plants |
| B. | Short day plants |
| C. | Day neutral plants |
| D. | None of the above |
| Answer» B. Short day plants | |
| 13325. |
For short day plants, the critical period is |
| A. | Light |
| B. | Dark |
| C. | Ultraviolet rays |
| D. | None of the above |
| Answer» C. Ultraviolet rays | |
| 13326. |
A bifacial organ bends towards, where |
| A. | Growth is more |
| B. | Growth is slow |
| C. | Darkness is there |
| D. | None of the above |
| Answer» C. Darkness is there | |
| 13327. |
Hormone is a |
| A. | Greek word |
| B. | Latin word |
| C. | Chinese word |
| D. | Indian word |
| Answer» B. Latin word | |
| 13328. |
Which of the following is absolutely necessary for germination [DPMT 1982] |
| A. | Light |
| B. | Water |
| C. | Low temperature |
| D. | Mineral salts |
| Answer» C. Low temperature | |
| 13329. |
According to F. Went, auxins transmit |
| A. | From apex to downward |
| B. | Opposite to A |
| C. | From centre to periphery |
| D. | Opposite to C |
| Answer» B. Opposite to A | |
| 13330. |
What causes delay in germination of seeds [DPMT 1985] |
| A. | Mechanical resistance of testa |
| B. | Impermeability of seed coat |
| C. | Unavailability of water and \[{{O}_{2}}\] |
| D. | All the above |
| Answer» E. | |
| 13331. |
Energy transfer in photosystem occurs as: |
| A. | Phycoerythrin \[\to \] Phycocyanin \[\to \]Carotenoid \[\to \] Chlorophyll a |
| B. | Chlorophyll b \[\to \] Carotenoid \[\to \]Phycoerythrin \[\to \] Chlorophyll a |
| C. | Phycocyanin \[\to \] Phycoerythrin \[\to \]Carotenoid \[\to \] Chlorophyll a |
| D. | Chlorophyll b \[\to \] Carotenoid \[\to \]Phycocyanin \[\to \] Chlorophyll a |
| Answer» B. Chlorophyll b \[\to \] Carotenoid \[\to \]Phycoerythrin \[\to \] Chlorophyll a | |
| 13332. |
The family in which many plants are \[{{C}_{4}}\] type: |
| A. | Malvaceae |
| B. | Solanaceae. |
| C. | Cruciferae |
| D. | Graminae |
| Answer» E. | |
| 13333. |
NADPH is generated through: |
| A. | Photosystem-I |
| B. | Photosystem-II |
| C. | Anerobic respiration |
| D. | Glycolysis |
| Answer» B. Photosystem-II | |
| 13334. |
What will be the consequence(s) of Warburg effect on photosynthesis? |
| A. | Low rate of process due to \[{{O}_{2}}\] supply |
| B. | Low rate of process due to \[C{{O}_{2}}\] supply |
| C. | Both [a] & [b] |
| D. | None of the above |
| Answer» B. Low rate of process due to \[C{{O}_{2}}\] supply | |
| 13335. |
Which one of the following pigment is not present in the chloroplast? |
| A. | Carotene |
| B. | Xanthophyll |
| C. | Chlorophyll 'b' |
| D. | Anthocyanin |
| Answer» E. | |
| 13336. |
Which is the evidence to show that \[{{O}_{2}}\] released in photosynthesis comes from water? |
| A. | Isotopic \[{{O}_{2}}\] supplied as \[{{H}_{2}}O\] appears in the \[{{O}_{2}}\] released in photosynthesis. |
| B. | Isolated chloroplast in water releases \[{{O}_{2}}\] if supplied potassium ferricyanide or some other reducing agent. |
| C. | Photosynthetic bacteria use \[{{H}_{2}}S\] and \[C{{O}_{2}}\] to make carbohydrates. |
| D. | All of the above |
| Answer» E. | |
| 13337. |
Maximum photosynthesis takes place in: |
| A. | Red light |
| B. | Blue light |
| C. | Bright light |
| D. | Green light |
| Answer» B. Blue light | |
| 13338. |
The diagram below shows the movement of substances into in and out of a chloroplast with labelling 1, 2, 3 & 4. What do labels 1 to 4 represent? |
| A. | 1234\[C{{O}_{2}}\]ATP\[{{H}_{2}}O\]Starch |
| B. | \[C{{O}_{2}}\]\[{{H}_{2}}O\]Sugar\[{{O}_{2}}\] |
| C. | \[{{H}_{2}}O\]\[{{O}_{2}}\]\[C{{O}_{2}}\]Sugar |
| D. | Sugar\[{{H}_{2}}O\]ATP\[{{O}_{2}}\] |
| Answer» D. Sugar\[{{H}_{2}}O\]ATP\[{{O}_{2}}\] | |
| 13339. |
Bacteriochlorophyll differs from chlorophyll 'a' in having: |
| A. | One pyrrole nucleus with one hydrogen |
| B. | One pyrrole nucleus with two hydrogen |
| C. | One pyrrole nucleus with three hydrogen |
| D. | One pyrrole nucleus with four hydrogen |
| Answer» C. One pyrrole nucleus with three hydrogen | |
| 13340. |
The first step in photosynthesis is [AIEEE 2004] |
| A. | Formation of ATP |
| B. | Ionisation of water |
| C. | Excitation of an electron of chlorophyll by a photon of light |
| D. | Attachment of \[C{{O}_{2}}\] to \[{{H}^{+}}\]ion |
| Answer» D. Attachment of \[C{{O}_{2}}\] to \[{{H}^{+}}\]ion | |
| 13341. |
Photosynthetically least efficient radiation is [Manipal 2005] |
| A. | Blue |
| B. | Yellow |
| C. | Green |
| D. | Red |
| Answer» D. Red | |
| 13342. |
Solar energy is converted into ATP in [CPMT 1990] |
| A. | Mitochondria |
| B. | Chloroplasts |
| C. | Ribosomes |
| D. | Peroxisomes |
| Answer» C. Ribosomes | |
| 13343. |
Emerson effect explain the phenomenon of [Kerala CET 2003; KCET 2003] |
| A. | Transpiration |
| B. | Absorption of water by roots |
| C. | Photosynthesis |
| D. | Respiration |
| Answer» D. Respiration | |
| 13344. |
Plants are known as purifiers of air due to process of [MP PMT 1996] |
| A. | Respiration |
| B. | Photosynthesis |
| C. | Transpiration |
| D. | Desiccation |
| Answer» C. Transpiration | |
| 13345. |
Sugar produced in photosynthesis is converted into starch in |
| A. | All plants |
| B. | Majority of plants |
| C. | Algae only |
| D. | Bacteria only |
| Answer» C. Algae only | |
| 13346. |
Photosynthesis is a process in which [BHU 1995] |
| A. | \[C{{O}_{2}}\]is reduced to carbohydrate |
| B. | NADH is reduced to NAD |
| C. | ATP is generated |
| D. | Oxidative phosphorylation occurs |
| Answer» B. NADH is reduced to NAD | |
| 13347. |
Which one of the following is due energy currency of the cell or The common immediate source of energy in cellular activity is [MP PMT 1986; CPMT 1977, 80, 89, 91] |
| A. | Phosphate |
| B. | ATP |
| C. | ADP |
| D. | AMP |
| Answer» C. ADP | |
| 13348. |
\[C{{O}_{2}}\]is formed in all of the following except [BHU 1977] |
| A. | Burning of sugar |
| B. | Respiration in plants |
| C. | Photosynthesis by plants |
| D. | On heating of limestone |
| Answer» D. On heating of limestone | |
| 13349. |
The percentage of light energy utilized for photosynthesis by higher plants is [CPMT 1972, 91; BHU 1979; RPMT 1990] |
| A. | 1 |
| B. | 0.5 |
| C. | 0.1 |
| D. | 1 to 2% |
| Answer» E. | |
| 13350. |
Photosynthesis is a [JIPMER 1986; MHCET 2002] |
| A. | Exothermic process |
| B. | Exergonic process |
| C. | Anabolic process |
| D. | Catabolic process |
| Answer» D. Catabolic process | |